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FirewallD Masquerading and route forwarding

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All,

I have two network interfaces on my PC and I want to route the stub
interface to the internet facing interface and perform Masquerading. My
Internet facing NIC is set to use zone drop and my inside facing zone is
set to use zone trusted.

# enable routing
echo 1 > /proc/sys/net/ipv4/ip_forward

# verify IP forwarding is enabled.
cat  /proc/sys/net/ipv4/ip_forward
1

# Configure Masquerade zone
firewall-cmd --zone=drop --add-masquerade --permanent
firewall-cmd --reload

# check masquerade configuration
firewall-cmd --zone=drop --query-masquerade
yes

# Ping Test Internet facing NIC.
ping -4 www.google.com
6 packets transmitted, 6 received, 0% packet loss, time 5008ms

# Ping test internal facing NIC.
ping -4I enx0000000011f1 www.google.com
23 packets transmitted, 0 received, 100% packet loss, time 22532ms

When sourcing from the internal NIC the ping fails which leads me to
believe Masquerade is not working.

Am I missing something?

Tim
-- 
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FirewallD Masquerading and route forwarding Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2023-03-18 02:00 +0100
  Re: FirewallD Masquerading and route forwarding Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2023-03-19 00:20 +0100

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